/*
 * Copyright (c) 2023 by Kang Wang. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.egolessness.destino.common.infrastructure.monitor;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.function.Consumer;

/**
 * a simple monitor
 *
 * @author zsmjwk@outlook.com (wangkang)
 */
public class Monitor<T> {

    private final List<Consumer<T>> consumers = new ArrayList<>();

    public void addListener(Consumer<T> consumer) {
        consumers.add(consumer);
    }

    public void addListener(Consumer<T> consumer, Executor executor) {
        consumers.add(t -> executor.execute(() -> consumer.accept(t)));
    }

    public void notifyUpdate(T data) {
        for (Consumer<T> consumer : consumers) {
            consumer.accept(data);
        }
    }

}
